Nope, I haven't a clue as to why there would be a line through the picture. I keep hearing about goofy things happening with Blogger recently, so maybe they were tweaking something at the time you uploaded?

Aaron, I LOVE your blog. Your artwork and projects are AWESOME! I have given you a blog award! All you have to do is post it on your blog with my name and blog link. Then you nominate 5 others and let them know!